Mitsubishi Grandis. Manual — part 284
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-21
Code No.B1045: Motor drive system for the front air mix damper
COMMENTS ON TROUBLE SYMPTOM
This code is set when the air mixing damper cannot
be rotated to the preset opening angle.
POSSIBLE CAUSES
• Malfunction of the front air mixing damper control
motor and potentiometer
• Malfunction of the automatic air conditioner
control panel (A/C-ECU)
• Damaged the wiring harness or connectors
DIAGNOSIS
Step 1. MUT-III actuator test
Check that the following actuator test can be
executed normally.
• Item 10: F.Air mix dumper motor: 0%
• Item 11: F.Air mix dumper motor: 50%
• Item 12: F.Air mix dumper motor: 100%
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 2.
A/C-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
FRONT AIR MIXING DAMPER CONTROL
MOTOR AND POTENTIOMETER
Front Air Mix Damper Control Motor And Potentiometer Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-22
Step 2. Connector check: C-105 A/C-ECU
connector and C-11 front air mixing damper
control motor and potentiometer connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
Step 3. Check the wiring harness between C-105
A/C-ECU connector (terminals 31 and 32) and
C-11 front air mixing damper control motor and
potentiometer connector (terminals 1 and 2).
• Check the motor activating lines for open or short
circuit.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the wiring harness.
AC310615
Connector: C-11 <LHD>
AC
Harness side
AC310628
Connector: C-11 <RHD>
AD
Harness side
AC310613
AC
Connector: C-105 <LHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310615
Connector: C-11 <LHD>
AC
Harness side
AC310628
Connector: C-11 <RHD>
AD
Harness side
AC310613
AC
Connector: C-105 <LHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-23
Step 4. Check the front air mixing damper control
motor and potentiometer.
Refer to
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the air mixing damper control
motor and potentiometer.
Step 5. MUT-III diagnosis code
Q: Is the diagnosis code set?
YES :
Replace the automatic air conditioner
control panel (A/C-ECU)
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
Code No. B1051,B1052: Potentiometer system for rear air mix damper <vehicles with LHD dual
automatic A/C>
COMMENTS ON TROUBLE SYMPTOM
This code is set when the rear air mixing damper
control motor potentiometer does not send any
signal to the A/C-ECU due to short or open circuit.
POSSIBLE CAUSES
• Malfunction of the rear air mixing damper control
motor and potentiometer
• Damaged the wiring harness or connectors
• Malfunction of the automatic air conditioner
control panel (A/C-ECU)
DIAGNOSIS
Step 1. MUT-III data list
Check that the following service data display
contents are normal. (Refer to
• Item 12: R.Air mix potentiometer
• Item 13: R.Air mix potentiometer (Target)
Q: Is the check result normal?
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
REAR AIR MIXING
DAMPER CONTROL
MOTOR AND
POTENTIOMETER
A/C-ECU
Rear Air Mixing Damper Control Motor And Potentiometer Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-24
YES :
Go to Step 5.
NO :
Go to Step 2.
Step 2. Connector check: C-106 A/C-ECU
connector and G-13-1 rear air mixing damper
control motor and potentiometer connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC311184
Connector: G-13-1
AB
Harness side
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